Project Design
Hydraulics
Pumping height and pipe network resistance
5.13.2 Pumping height
and pipe network
resistance
The device-internal water circulation pump of Aquarea heat pumps differs
in delivery height and delivery volume according to the series and model
version. In addition, there are distinctions between standard pumps, high-
efciency pumps without differential pressure control and high-efciency
pumps with differential pressure control (see also unit overview at the
start of the document and the technical data).
While standard pumps have xed congurable pump levels, high efciency
pumps have automatic speed control with a ner pump level setting
option, which results in different pump curve characteristics (see the
following sections).
Pump speed 3
Pump speed 2
Pump speed 1
90
80
70
60
50
40
30
20
10
0
Flow rate [l
/ min]
Minimum circulation Rated volume circulation
0
✔
Sample pipe network resistance characteristic curve with a correctly set rated volume
circulation at pump level 2 (standard pump) for the WH-MXF12D6E5
When designing the pump delivery head, all components of the piping
network and their individual resistances must be incorporated at their
rated volume ow. Components like mixers, valves and heat meters
must be selected so that the rated ow matches the rated volume ow
of the heat pump system.
Tipp 1: Note the rated volume ow
For efcient heat generation, heat pumps work with a spread between
the supply and return ows of approx. 5 K. That distinguishes them from
heat generators with burners, which can easily cope with a spread
between the supply and return ows of roughly 10 or 20 K. The low
temperature spread of heat pumps means that the volume ow of heat
pumps is generally higher than heat generators with burners for trans-
porting the same heat output. When planning, you must therefore pay
particular attention to the rated volume ow and the resulting resistance
of the pipe network.
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